Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: mptcp: pm: only mark 'subflow' endp as available Adding the following warning ... WARN_ON_ONCE(msk->pm.local_addr_used == 0) ... before decrementing the local_addr_used counter helped to find a bug when running the "remove single address" subtest from the mptcp_join.sh selftests. Removing a 'signal' endpoint will trigger the removal of all subflows linked to this endpoint via mptcp_pm_nl_rm_addr_or_subflow() with rm_type == MPTCP_MIB_RMSUBFLOW. This will decrement the local_addr_used counter, which is wrong in this case because this counter is linked to 'subflow' endpoints, and here it is a 'signal' endpoint that is being removed. Now, the counter is decremented, only if the ID is being used outside of mptcp_pm_nl_rm_addr_or_subflow(), only for 'subflow' endpoints, and if the ID is not 0 -- local_addr_used is not taking into account these ones. This marking of the ID as being available, and the decrement is done no matter if a subflow using this ID is currently available, because the subflow could have been closed before.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 06faa22710342bca5e9c249634199c650799fce6 before 7fdc870d08960961408a44c569f20f50940e7d4f; affected 06faa22710342bca5e9c249634199c650799fce6 before 43cf912b0b0fc7b4fd12cbc735d1f5afb8e1322d; affected 06faa22710342bca5e9c249634199c650799fce6 before 9849cfc67383ceb167155186f8f8fe8a896b60b3; affected 06faa22710342bca5e9c249634199c650799fce6 before 322ea3778965da72862cca2a0c50253aacf65fe6 |
| Linux / Linux | affected 5.13; unaffected 0 before 5.13; unaffected 6.1.108 through 6.1.*; unaffected 6.6.48 through 6.6.*; unaffected 6.10.7 through 6.10.*; unaffected 6.11 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/7fdc870d08960961408a44c569f20f50940e7d4f
- https://git.kernel.org/stable/c/43cf912b0b0fc7b4fd12cbc735d1f5afb8e1322d
- https://git.kernel.org/stable/c/9849cfc67383ceb167155186f8f8fe8a896b60b3
- https://git.kernel.org/stable/c/322ea3778965da72862cca2a0c50253aacf65fe6
ADP enrichment
No English description supplied.
No references supplied.
No English description supplied.